Using a tuner pedal to send midi command through MC6 Pro

Is it possible to somehow use the button on a tuner pedal (such as the Peterson Strobostomp or TC Polytune) to trigger sending a CC message from the MC6 Pro? I’m thinking I could plug the tuner’s 1/4" output into an Omniport, and somehow set it up so a message is sent when the tuner mutes the signal via pressing its button.

My use case is pretty unique–I have a wireless guitar receiver in a rack that’s running a TS cable back out to the tuner. I need to be able to mute the guitar via midi while tuning, without taking up an additional button on the MC6 Pro itself or running an additional cable. Can this be done, possibly by using the Relay Interface box in reverse?

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